Question

A student attached a 0.5kg object to a 0.7m string and rotates the object around her head and parallel to the ground. How much tension force is required to make the object rotate with a speed of 12 m/s?

Answer 1

mass = m = 0.5 kg

radius = r = 0.7 m

speed = V = 12 m/sec

TENSION = T = m v^2 / r

                 T = 0.5 * 12^2 / 0.7
               
                  T = 102.8 N

                    T = 103 N